英语周报2020—2021改高一第5答案

1.解析:选DA、细菌中存在既含有蛋白质又含有核酸的结构,如核糖体,A错误;B、洋葱的根尖成熟区细胞中无叶绿体,但有大液泡,可以发生质壁分离,B错误;C、原核生物有生物膜,如细胞膜,C错误;D、同一生物体不同细胞内所含的遗传物质相同,但由于基因的选择性表达,不同细胞内所含的细胞器的种类与数量不同,即这是细胞分化的结果,D正确。故选:D

第三节One possibleversionParagraph 1He was determined to protect the flowers. So he built ahigh wall around them. Not feeling satisfied, he even setup rules as to who could enter the garden, how they mustenter,and what they must follow while they were there.Asa result, children were forbidden to enter and appreciatethe flowers as before. For his part, he continued to see to itthat his treasure received enough sunlight and water so thatthe flowers continued to perform their wonderful magicParagraph 2Hethe flowers seemed to fade day by day,so theman went everywhere for help. He visited every expert, onlyto find his efforts in vain. He felt on pins and needles, see-ing his beloved flowers dying. One evening, he was wan-dering on the street aimlessly when he suddenly noticed theflower woman on the same spot where he had met her, giving away her amazing flowers. It finally dawned on him thatthe flowers are gifts not passessions and that only by sharingcan the magic remain and last

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